CN112624427A - High salt waste water removes processing system of organic matter - Google Patents
High salt waste water removes processing system of organic matter Download PDFInfo
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- CN112624427A CN112624427A CN202011609813.2A CN202011609813A CN112624427A CN 112624427 A CN112624427 A CN 112624427A CN 202011609813 A CN202011609813 A CN 202011609813A CN 112624427 A CN112624427 A CN 112624427A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/005—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by heat treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/007—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by irradiation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C02F2101/10—Inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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Abstract
The invention provides a treatment system for removing organic matters from high-salinity wastewater, which comprises at least one first-stage heterogeneous ozone oxidation tower with upper water inlet and lower water outlet, at least one second-stage heterogeneous ozone oxidation tower with lower water inlet and upper water outlet, and at least two photocatalytic oxidation sections, wherein the first-stage heterogeneous ozone oxidation tower is internally provided with a water inlet distributor, a plurality of stainless steel corrugated packing layers and an ozone distributor, the second-stage heterogeneous ozone oxidation tower is internally provided with a catalyst layer containing alloys such as nickel-chromium-titanium and the like, the photocatalytic oxidation section is internally provided with an ozone distributor and a plurality of photoelectric tubes with adjustable light-emitting wavelengths, each ozone distributor is externally connected with an ozone generator, and each heterogeneous ozone oxidation tower and each photocatalytic oxidation section are also connected with a tail gas treatment device. The invention has low input and operation cost, does not need to add chemical agents regularly, does not generate solid hazardous waste, has good effect of removing organic matters in the wastewater, and also solves the problems of potential safety hazards of high temperature and high pressure and incomplete oxidation of the organic matters.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a treatment system for removing organic matters from high-salinity wastewater.
Background
In the daily life and production of people, a large amount of organic compounds are used, most of the organic compounds are synthesized artificially, a salt forming reaction is involved in a chemical organic synthesis process, a target product is obtained, a large amount of waste water is inevitably discharged, and the destructive influence of water-soluble organic waste water on the environment is very large.
For wastewater with total salt content exceeding 1% mass fraction of water, the wastewater is generally called high-salinity wastewater in the industry, and is generally from chemical plants, collection and processing of petroleum and natural gas, and the like. According to different production processes, the variety and chemical properties of organic matters contained in the high-salinity wastewater are greatly different, the generation ways of the saline wastewater are wide, and the wastewater discharge amount is increased year by year.
The existing process for treating organic matters in high-salinity wastewater comprises a Fenton method, a micro-electrolysis method, an ozone oxidation method, a wet oxidation method and the like, and the process has the following characteristics:
1. the Fenton method: the method needs to adjust the pH value of the water body back to acidity by adding acid, then adds medicaments such as hydrogen peroxide and ferrous sulfate to precipitate organic matters dissolved in the water, generates a large amount of hazardous waste solids after treatment, also has influence on the environment, and has incomplete oxidative decomposition on the organic matters.
2. And (3) micro-electrolysis: the method is based on the electrochemical principle, two conductors with different electronegativities are directly connected together and immersed in electrolyte liquid with conductivity to form a primary battery, charged ions in the solution move to an electrode with opposite charges to react by utilizing the electric field effect around the conductors, and simultaneously, products generated by the electric reaction and chemical substances in the solution are chemically changed, so that the aim of removing chemical pollutants is fulfilled. The method has long reaction time, the added filler needs to be replaced and treated at intervals, the pH value of the water body also needs to be adjusted to be acidic, and a large amount of hazardous waste solids are generated; in addition, micro-electrolysis belongs to reduction reaction, has no oxidation effect on organic matters, and can only be used as an early pretreatment step of oxidation reaction.
3. An ozone oxidation method: the method is a method for purifying and disinfecting waste water by using ozone as an oxidant. Compared with the former two, the method has better treatment effect and environment-friendly aspect, but the single ozone oxidation decomposition has stronger pertinence, partial unsaturated bond organic matters such as aliphatic hydrocarbon can be cracked and broken to be oxidized, and the treatment effect of the saturated bond organic matters and other types of organic matters is poorer.
4. Wet oxidation method: the method is a method for carrying out high-temperature high-pressure oxidation treatment on organic matters suspended or dissolved in liquid in the presence of liquid-phase water, wherein the oxidation reaction is carried out at the reaction temperature of 300 ℃ under the condition of pressing high-pressure air. Although the method can achieve a better treatment effect, the method needs to meet the treatment conditions of high temperature and high pressure, and has the advantages of high energy consumption, large investment, high operation cost and great potential safety hazard.
In view of the foregoing, there is a need in the art for a system for treating organic matter in wastewater that overcomes the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to provide a system for treating organic matters in wastewater, which has the advantages of low cost, good effect and simple operation and can solve the problems of solid hazardous waste generation and high-temperature and high-pressure potential safety hazards.
In order to achieve the aim, the invention provides a treatment system for removing organic matters from high-salinity wastewater, which comprises an ozone generating device, an ozone oxidation device, a photocatalytic decomposition device and a tail gas treatment device;
the ozone oxidation device comprises at least one first-stage heterogeneous ozone oxidation tower and at least one second-stage heterogeneous ozone oxidation tower, wherein a water inlet of the first-stage heterogeneous ozone oxidation tower is arranged at the upper part, a water outlet of the first-stage heterogeneous ozone oxidation tower is arranged at the lower part, a water inlet distributor, a plurality of packing layers and an ozone distributor which are connected with the water inlet are sequentially arranged in the first-stage heterogeneous ozone oxidation tower from top to bottom, a water inlet of the second-stage heterogeneous ozone oxidation tower is arranged at the lower part, a water outlet of the second-stage heterogeneous ozone oxidation tower is arranged at the upper part, and a catalyst layer;
photocatalytic decomposition device includes two at least photocatalytic oxidation chemical segment set up ozone uniform distributor and a plurality of luminous wavelength adjustable photoelectric tube in the photocatalytic oxidation chemical segment, tail gas processing apparatus passes through the top intercommunication of tail gas duct and each heterogeneous ozone oxidation tower and photocatalytic oxidation chemical segment, ozone generating device passes through ozone duct and each heterogeneous ozone oxidation tower and the ozone uniform distributor intercommunication in the photocatalytic oxidation chemical segment, and the high salt waste water passes through behind each heterogeneous ozone oxidation tower and the photocatalytic oxidation chemical segment in proper order and discharges through the outlet.
Preferably, a water inlet flow meter is arranged on a water inlet pipeline of the high-salinity wastewater, and a gas flow meter is arranged on each ozone conveying pipe.
Preferably, the filler used in the filler layer is stainless steel corrugated plates, and the stainless steel corrugated plates of the upper and lower filler layers are arranged in a staggered manner; the catalyst used in the catalyst layer includes at least one of nickel, chromium, and titanium.
Preferably, the photocatalytic decomposition device comprises a photocatalytic oxidation A section and a photocatalytic oxidation B section, and the wavelength of the photoelectric tube arranged in the photocatalytic oxidation A section is set to be
And
the wavelength of the photoelectric tube arranged in the B section of the photocatalytic oxidation is set as
And
preferably, the tail gas processing apparatus includes a tail gas processing container, a heating pipe, a photoelectric tube and a filter layer arranged in the tail gas processing container, and an induced draft fan and a tail gas outlet arranged on the tail gas processing container.
Preferably, the number of the heating pipes and the photoelectric pipes in the tail gas treatment container is multiple, and the heating pipes and the photoelectric pipes are arranged in an alternating manner.
Preferably, the drain port is in communication with a circulating water basin.
Preferably, a water body monitoring device is arranged between the water outlet and the circulating water pool, and a gas monitoring device is arranged at the tail gas outlet.
The technical scheme provided by the invention at least has the following beneficial effects:
1. the invention adopts a treatment process of multi-stage heterogeneous ozone oxidation and ozone photocatalytic oxidation, no chemical agent is additionally added, no precipitate is generated, and the problem of environmental pollution caused by solid hazardous waste is solved from the source.
2. The invention selects different catalysts and photoelectric tubes with different light-emitting wavelengths for different organic matters to realize comprehensive oxidation and decomposition of various organic matters in the wastewater, and simultaneously, through special design of different heterogeneous ozone oxidation tower structures, ozone and wastewater in a first-stage heterogeneous ozone oxidation tower reversely flow and fully react on a corrugated packing layer, and wastewater in a second-stage heterogeneous ozone oxidation tower fully reacts with the catalyst layer from bottom to top to realize complete removal of the organic matters in the wastewater, so that the wastewater reaches the emission standard.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a flow chart showing the structure of a system for treating high-salinity wastewater with organic matters removed in example 1 of the present invention;
wherein: 1 ozone generator, 2 heterogeneous ozone oxidation towers of one-level, 3 heterogeneous ozone oxidation towers of second grade, 4 photo catalytic oxidation A sections, 5 photo catalytic oxidation B sections, 6 uniform distributors that intake water, 7 packing layers, 8 ozone uniform distributors, 9 catalyst layers, 10 phototubes, 11 tail gas conveying pipes, 12 ozone conveying pipes, 13 flowmeter that intakes water, 14 gas flowmeter, 15 tail gas treatment container, 16 heating pipes, 17 filter layers, 18 draught fans, 19 tail gas outlets.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, a treatment system for removing organic matters from high-salinity wastewater comprises an ozone generating device 1, an ozone oxidation device, a photocatalytic decomposition device and a tail gas treatment device.
Ozone oxidation unit includes a heterogeneous ozone oxidation tower of one-level 2 and the heterogeneous ozone oxidation tower of second grade 3, the water inlet setting of the heterogeneous ozone oxidation tower of one-level 2 is in upper portion and the delivery port setting is in the lower part set gradually the equipartition ware 6, three packing layer 7 and the ozone equipartition ware 8 of intaking that is connected with the water inlet from top to bottom in the heterogeneous ozone oxidation tower of one-level 2, the water inlet setting of the heterogeneous ozone oxidation tower of second grade 3 is in the lower part and the delivery port setting is on upper portion set up catalyst layer 9 in the heterogeneous ozone oxidation tower of second grade 3.
Photocatalytic decomposition device includes two photocatalytic oxidation chemical industry sections, and photocatalytic oxidation A section 4 and photocatalytic oxidation B section 5 equally divide in these two photocatalytic oxidation chemical industry sections and do not are equipped with ozone uniform distributor 8 and a plurality of light emitting wavelength adjustable photoelectric tube 10, tail gas processing apparatus passes through tail gas conveying pipe 11 and two heterogeneous ozone oxidation towers and two photocatalytic oxidation chemical industry sections's top intercommunication, ozone generating device 1 passes through ozone conveying pipe 12 and two heterogeneous ozone oxidation towers and two photocatalytic oxidation chemical industry sections in ozone uniform distributor 8 intercommunication, and high salt waste water passes through behind each heterogeneous ozone oxidation tower and the photocatalytic oxidation chemical industry section in proper order and discharges through the outlet.
A water inlet flow meter 13 is arranged on a water inlet pipeline of the high-salinity wastewater, and a gas flow meter 14 is arranged on an ozone conveying pipe 12 correspondingly connected with each ozone uniform distributor 8.
The tail gas treatment device comprises a tail gas treatment container 15, a heating pipe 16, a photoelectric pipe 10, a filter layer 17, an induced draft fan 18 and a tail gas outlet 19, wherein the heating pipe 16, the photoelectric pipe 10 and the filter layer 17 are arranged in the tail gas treatment container 15, and the induced draft fan 18 and the tail gas outlet 19 are arranged on the tail gas treatment container 15. The draught fan 18 generates negative pressure to drive tail gas to flow, the heating pipe 16 and the photoelectric tube 10 can be used for treating redundant ozone and trace other waste gas, the filtering layer 17 is used for slowly buffering the waste gas to be discharged into the atmosphere, and the qualified tail gas treatment can be favorably realized and then the tail gas is emptied.
In this embodiment, the filler used in the filler layer 7 is a stainless steel corrugated plate, and the stainless steel corrugated plates of the upper and lower filler layers are staggered; the catalyst used in the catalyst layer 9 is made of alloy materials such as nickel chromium titanium and the like.
In the present embodiment, the wavelength of the photoelectric cell provided in the photocatalytic oxidation a-stage is set to
And
the wavelength of the photoelectric tube arranged in the B section of the photocatalytic oxidation is set as
And
the wavelength of the heating pipe arranged in the tail gas treatment container is set as
The heating pipe arranged in the tail gas treatment container is specifically an infrared heating pipe and the heating temperature is 150 ℃.
In this embodiment, the number of the heating pipes and the photoelectric pipes in the exhaust gas treatment container 15 is multiple, and the heating pipes and the photoelectric pipes are arranged alternately.
In this embodiment, the drain port communicates with the circulation tank. The qualified water flows into the circulating water tank and can be returned to the production for secondary use, so that water resources are saved, and the water consumption in the production is reduced.
In this embodiment, a water body monitoring device is arranged between the water outlet and the circulating water tank, and a gas monitoring device is arranged at the tail gas outlet for detecting the treatment effect and checking and accepting the water body and the gas according to the emission standard.
All of this embodiment equipment moves under normal atmospheric temperature and pressure, and the body of facilities such as body of the tower, oxidation tank, tail gas processing apparatus all adopts 304 stainless steel, and connecting line all adopts corrosion-resistant stainless steel pipe and engineering plastics, and the outward appearance is clean and tidy beautiful, the washing of being convenient for, and long service life.
The working process of the high-salinity wastewater organic matter removal treatment system is as follows:
the high-salinity wastewater containing organic matters after the pretreatment of precipitation separation enters a one-level heterogeneous ozone oxidation tower 2 through metering, enters a stainless steel corrugated packing layer 7 through a water inlet uniform distributor 6, the metered ozone enters the tower from an ozone uniform distributor 8 at the bottom and fully contacts with the wastewater through the packing layer 7 to be oxidized, and the organic matters in the wastewater are decomposed by breaking bonds under normal pressure.
Other organic matters which are not completely decomposed flow down along with the wastewater and enter the second-stage heterogeneous ozone oxidation tower 3 from the lower part, along with the increase of the water level of the wastewater, the wastewater is mixed with the ozone and then is gradually in full contact with the catalyst layer 9 to carry out catalytic oxidation, the breaking of bonds and the oxidative decomposition of most organic matters are basically completed, and for the organic matter water body of which the ozone is difficult to decompose, the water flows into the photocatalytic oxidation A section 4 under normal pressure.
Under the catalysis of a phototube with a specific type selection, the organic matters which are difficult to decompose are uniformly mixed with ozone for further catalytic oxidation decomposition, and the organic matters which are difficult to decompose and are not completely decomposed continue to enter a photocatalytic oxidation B section 5 for subsequent catalytic oxidation until the decomposition is completely finished.
The treatment system for removing organic matters from high-salinity wastewater is provided with a secondary oxidation reaction tower, wherein alcohols, ketones, aldehydes, phenols, general organic acids, benzenes and other organic matters which are easy to decompose and unsaturated bonds can basically complete broken bond decomposition in the primary oxidation reaction tower, and a heterogeneous corrugated packing layer in the tower carries out oxidative decomposition on ozone and wastewater with controllable proportion; and more complicated organic matters such as heterocycles, furan, pyridine, DMF and the like and organic matters containing saturated bonds are subjected to catalytic oxidation by combining targeted catalyst fillers with ozone to carry out two-stage heterogeneous decomposition, and meanwhile, the opening and bond breaking oxidative decomposition of the organic matters which are not decomposed in the first stage can be perfected.
The catalyst in the secondary oxidation reaction tower is a characteristic alloy material, is corrosion-resistant, is added at one time, does not need to be supplemented and regenerated, is convenient to clean and has long service life; the connecting wires and the control circuit of each photoelectric tube are arranged outside, so that centralized control and maintenance are facilitated.
The treatment system for removing organic matters from high-salt wastewater in the embodiment is applied to the production process of a certain enterprise, the discharge amount of the original high-salt organic wastewater is 200 tons/day, wherein COD is approximately 32000mg/L, ammonia nitrogen is approximately 1250mg/L, the main components of organic matters are methyl pyrrolidone, dichloromethane and aminobenzene, salt is mainly sodium chloride, the content of the salt is 12%, in the wastewater discharged after improvement, COD is less than or equal to 500mg/L, and ammonia nitrogen is less than or equal to 30mg/L, and the discharge standard of an industrial park where the enterprise is located is completely met.
The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and various modifications and changes may be made by those skilled in the art. Any improvement or equivalent replacement directly or indirectly applied to other related technical fields within the spirit and principle of the invention and the contents of the specification and the drawings of the invention shall be included in the protection scope of the invention.
Claims (8)
1. A treatment system for removing organic matters from high-salinity wastewater is characterized by comprising an ozone generating device, an ozone oxidation device, a photocatalytic decomposition device and a tail gas treatment device;
the ozone oxidation device comprises at least one first-stage heterogeneous ozone oxidation tower and at least one second-stage heterogeneous ozone oxidation tower, wherein a water inlet of the first-stage heterogeneous ozone oxidation tower is arranged at the upper part, a water outlet of the first-stage heterogeneous ozone oxidation tower is arranged at the lower part, a water inlet distributor, a plurality of packing layers and an ozone distributor which are connected with the water inlet are sequentially arranged in the first-stage heterogeneous ozone oxidation tower from top to bottom, a water inlet of the second-stage heterogeneous ozone oxidation tower is arranged at the lower part, a water outlet of the second-stage heterogeneous ozone oxidation tower is arranged at the upper part, and a catalyst layer;
photocatalytic decomposition device includes two at least photocatalytic oxidation chemical segment set up ozone uniform distributor and a plurality of luminous wavelength adjustable photoelectric tube in the photocatalytic oxidation chemical segment, tail gas processing apparatus passes through the top intercommunication of tail gas duct and each heterogeneous ozone oxidation tower and photocatalytic oxidation chemical segment, ozone generating device passes through ozone duct and each heterogeneous ozone oxidation tower and the ozone uniform distributor intercommunication in the photocatalytic oxidation chemical segment, and the high salt waste water passes through behind each heterogeneous ozone oxidation tower and the photocatalytic oxidation chemical segment in proper order and discharges through the outlet.
2. The high-salinity wastewater organic matter removing treatment system according to claim 1, wherein a water inlet flow meter is arranged on the water inlet pipeline of the high-salinity wastewater, and a gas flow meter is arranged on each ozone conveying pipe.
3. The high-salinity wastewater organic matter removing treatment system according to claim 2, wherein the filler used in the filler layer is stainless steel corrugated plates, and the stainless steel corrugated plates of the upper and lower filler layers are arranged in a staggered manner; the catalyst used in the catalyst layer includes at least one of nickel, chromium, and titanium.
4. The high salinity wastewater removes processing system of organic matter of claim 3, characterized in that, the photocatalytic decomposition device includes photocatalytic oxidation A section and photocatalytic oxidation B section, the wavelength of the photoelectric tube that sets up in photocatalytic oxidation A section sets up to be
And
the wavelength of the photoelectric tube arranged in the B section of the photocatalytic oxidation is set as
And
5. the high-salinity wastewater organic matter removing treatment system according to any one of claims 2 to 4, wherein the tail gas treatment device comprises a tail gas treatment container, a heating pipe, a photoelectric pipe and a filter layer which are arranged in the tail gas treatment container, and an induced draft fan and a tail gas outlet which are arranged on the tail gas treatment container.
6. The high-salinity wastewater organic matter removing treatment system according to claim 5, wherein the number of the heating pipes and the number of the photoelectric pipes in the tail gas treatment container are both multiple and are arranged in an alternating manner.
7. The high salinity wastewater removes processing system of organic matter according to claim 6, characterized in that, the outlet communicates with the circulating water pond.
8. The high-salinity wastewater organic matter removing treatment system according to claim 7, wherein a water body monitoring device is arranged between the water outlet and the circulating water tank, and a gas monitoring device is arranged at the tail gas outlet.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114471603A (en) * | 2022-01-24 | 2022-05-13 | 上海中耀环保实业有限公司 | Non-supported ozone catalyst and use method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114471603A (en) * | 2022-01-24 | 2022-05-13 | 上海中耀环保实业有限公司 | Non-supported ozone catalyst and use method thereof |
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